Can you paste the code that is causing the crash?

Can you paste the code that is causing the crash?

This error was from a production repository with a non permissive license; however I was able to create a reproduction below:

--[[
1. Create a generic
2. @native function
3. cast return of @native function to typeof(fn())?
4. unreachable!()
]]

-- can also be type Message<T> = T
type Message<T> = {
	time: number,
	data: T
}

-- must be @native
@native
local function fn(keys: { [string]: string }?): { [string]: Secret | string } end

-- must death cast
local headers = (fn() :: typeof(fn())?)

Nevermind; you do not need a generic to trigger this: Message can also be Message; e.g.

type A = unknown
@native local function fn(k: { [string]: string }?): { [string]: Secret | string } end
fn(fn() :: typeof(fn())?)

In fact, all you need is this, and full_moon panics:

type A = unknown
@native function fn() end

I don't think full moon supports function attributes yet, which seems to be the main issue. Although i'm not sure why we end up panicking in that case

Will repurpose this issue to support parsing function attributes, which should in the end stop this particular crash. If we see the crash again, will make a separate issue for it